Other Definitions
tree line (dict)

Tree-line

• Arctic tree-line The furthest north in the Northern Hemisphere that trees can grow; further north, it is too cold to sustain trees.
• Antarctic tree-line The furthest south in the Southern Hemisphere that trees can grow; further south, it is too cold to sustain trees.
• Alpine tree-line The highest elevation that trees can grow on mountains; higher up, it is too cold to sustain trees.
• Exposure tree-line On coasts, and on isolated mountains, the tree-line is often much lower than in corresponding altitudes inland and in larger, more complex mountain systems, because high wind speeds adversely affect tree growth.
• Desert tree-line The driest places that trees can grow; drier desert areas having insufficient rainfall to sustain trees.
• Wetland tree-line The wettest ground on the margins of muskegs and bogs that trees can grow in, below which the ground is too saturated with water, excluding oxygen from the soil that tree roots need to grow. However no such line exists for swamps, where trees, such as Bald cypress and the many mangrove species, are adapted to growing in permanently water-logged soil.

Typical tree-line species

• Foxtail pine (Pinus balfouriana)
• Bristlecone pine (Pinus aristata, Pinus longaeva)
• Potos pinyon (Pinus culminicola)
• Macedonian pine (Pinus peuce)
• Whitebark pine (Pinus albicaulis)
• Swiss pine (Pinus cembra)
• Mountain pine (Pinus mugo)
• Hartweg's pine (Pinus hartwegii)
• Subalpine larch (Larix lyallii)
• Arctic white birch (Betula pubescens subsp. tortuosa)
• Snow gum (Eucalyptus pauciflora)
• Antarctic beech (Nothofagus antarctica)

Table of alpine tree-lines

Table of arctic and antarctic tree-lines

Reference

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